Radio shielding manifold



June 26, 194 5. .TIERNEY, JR 2,379,322

RADId SHIELDING MANIFOLD Filed Sept. 2, 1943 2 Sheets-Sheet 1 &

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SAMUEL 15%??? BY I ATTORNEYS- June 26, 1945- s. I'IERNEY, JR 2 2,379,322

I RADIO SHIELDIHG IILRNIFOLD Filed Sept, 2, 1943 2 Sheets-Sheet 2 i INVENTOR.

147' TOKNE Y5 Patented, June 26, 1945 RADIO SHIELDING MANIFOLD Samuel Tierney, In, Westfield, N. J., assignor to Breeze Corporations, Ina, Newark, N, 1., a corporation of New Jersey Application September 2, 1943, Serial No. 501,027

17 Claims.

This invention relates to radio shielding manifolds, as used in aeroplanes and other power driven structures, in which radio communications may be detrimentally affected by electric currents diverted from the power plant installed therein.

While such shielding devices for ignition systems are well known and in common use, they are usually quite complicated, critically subject to derangement with consequent failure, and are highly expensive to construct and assemble.

One of the objects of the present invention is to provide a radio shielding manifold, including inlets, outlets and attachment brackets, all of substantially integral construction.

A further feature is in the provision of a manifold having walls composed wholly of synthetic resinous material, combined with finely divided conductive metallic particles held in positive electrical contact, or provided with a similar conductive coating and/or lining, of such comminuted substances bonded by plasticmaterial.

Another purpose is to produce the main parts is formed in metal molds, under extreme pres sure. no machining being required.

These objects, together with others of a similar nature, are accomplished by the novel and practical construction, combination and arrangement of parts hereinafter described and illustrated in the accompanying drawings. constituting a graphical component of this disclosure. and in which:

Figure 1 is a plan view of an embodiment of the invention, complete with clamping and supporting lugs, inlet and outlet bosses, and the construction and purpose.

Figure 2 is a fragmentary sectional view of the dies for forming the two equal halves of the manifold.

Figure 3 is a perspective sectional view of one of the manifold sections, showing metallic particles incorporated therein.

Figure 4 is a similar view showing the metallic particles contained in the outer coating only.

Figure 5 is another like view, but having the particles disposed asan interior lining.

Figure 6 is a sectional view of both parts as provided, with both a coating and lining. the

ection being taken on line 6 8 of Figure 1.

Figure 7 is a similar sectional view, looking n line 'i-1 of Figure 2, showing the particles s distributed uniformly within the structure.

of the manifold in two sections, each of which upper half partly broken away to indicate its Figure 8 is a sectional view taken on line 8-8 of Figure 1. As indicated in the drawings, the manifold is composed of two main sections l5 and i8, re-

median line corresponding to the axial center of the tube formed by uniting the sections. I

While a circular manifold is shown, it is to be understood that the shape will conform to the in These sections are identical, being formed in dies l1 and I8, respectively upper and lower, under great pressure, in the presence of heat supplied by steam or hot liquids circulating dies. The insulating material used for the sec-.

tions may be any preferred thermo-setting plastic composition which ill not deteriorate at the temperature to which it is exposed in the engine. Phenolic compositions such as Bakelite are especially suitable.

If the installation is to be made where the manifold is subject to high temperatures, during the, operation of the engine, the molding materialmay be of non-inflammable, thermally stable, compositions, well known in the art.

-In any case, the plastic material has thoroughly incorporated in it finely divided particles P, of any selected metal, non-ferrous and having good electrical conductive properties, such as aluminum, copper, etc which will not detrimentally afi'ect the material.

The fine metallic particles should be thoroughly. mixed with the plastic composition, and

and also for attaching to supports X, part of the engine frame, to afford grounding means.

One or more inlet bosses 24 are integrally formed and also the required number ofpoutlet bosses 25 through which extend shielded conductor cables 26 from the inlet to each spark plug of the engine.

The inlet and outlet bosses may be die formed spectively upper and lower, joined along a shape and type of engine to which it is applied.

through passages i9 and 20 in the respectivefor shielding certain frequencies the particles to produce screw threads to receive clamp nuts 21, the threads being preferably over-size to permit of screw thread die chasing whereby the metal particles are brought directly into contact with the nuts. The nuts 21 hold the two sections l5 and I6 together in addition to the lug bolts, and also hold the shielded cable tothe manifold.

The cross-section of one of the tube elements containing a uniform dispersion of metallic granules P is shown in Figure 3; a skin coating only of metal particles P is indicated in Figure 4, while Figure 5 exhibits an inner lining only.

Both inner and outer surfaces are shown as having a layer of metal particles in Figure 6, which may be accomplished by applying a coat of insulative varnish filled with the particles to the walls of the dies just before entering the plastic material.

This view also shows the connecting and supporting lugs 22 and 23, while Figure '7 shows a section, similar to Figure 3, but provided with a hollow boss 25. 7

Although the foregoing is descriptive of the best known embodiments of the invention, it is not to be construed as limitative, but rather suggestive of the invention, which may include such modifications as are denoted in the claims.

Having thus described the invention and set forth the manner of its construction and application, what is claimed as new and sought to be secured by Letters Patent of the United States, is:

l. A rigid manifold disposed between the spark plugs and magneto of an internal combustion engine and adapted to receive a plurality of ignition wires, comprising two substantially uniform hollow sections, lugs on each section in spaced correspondence, and means to clamp said lugs to hold said sections in registration,

2. A rigid manifold disposed between the spark plugs and magneto of an internal combustion engine and adapted to receive a plurality of igni tion wires, comprising two substantially uniform hollow sections, clamp lugs integral with each of said sections, and support lugs integral with each of said sections.

3. A rigid manifold disposed between the spark plugs and magneto of an internal combustion engine and adapted to receive a plurality of ignition wires, comprising two substantially uniform hollow sections, clamp lugs integral with each of said sections, and support lugs integral with each of said sections, all of said sections and lugs being formed from synthetic resinous material filled with particles of metal in contacting relation forming electric conductors.

4. A rigid manifold disposed between the spark plugs and magneto of an internal combustion engine and adapted to receive a plurality of ignition wires, comprising at least two concave sections suited for edge engagement, integral lugs on each section, means to clamp said lugs, other lugs on said sections to attach to supports, the walls of said sections and lugs being formed of synthetic resinous material having incorporated therein contacting particles of conductive material to provide an electrical conductive path to ground.

5. A rigid manifold disposed between the spark plugs and magneto of an internal combustion engine and adapted to receive a plurality of ignition wires, comprising at least two concave sections suited for edge engagement, integral lugs on each section, means to clamp said lugs, other lugs on said sections to attach to supports, the

walls of said sections and lugs being. formed of synthetic resinous material having incorporated in their outer surfaces particles of metal to provide an electrical conductive path to ground.

6. A rigid manifold disposed between the spark plugs and magneto of an internal combustion engine and adapted to receive a plurality of ignition wires,'comprising at least two concave sections suited for edge engagement, integral lugs on each section, means to clamp said lugs, other lugs on said sections to attach to supports, the walls of said sections and lugs being formed of synthetic resinous material having incorporated in their inner surfaces metal particles to constitute an electrical shield.

7. A radio shielding manifold adapted to receive a plurality of ignition wires leading to the spark plugs of an engine, comprising a pair of semicylindrical members having corresponding clamp lugs to hold the members in registration, outlet bosses formed integrally at the junction of said members, and other integral lugs on said members to support the manifold on an engine, all of said members being formed by molding a compound of thermo-setting resin and conductive metal particles.

8. A radio shielding manifold adapted to receive a plurality of ignition wires leading to the spark plugs of an engine, comprising a pair of semi-tubular members clamp lugs to hold the members in registration, outlet bosses formed integrally at the junction of said members, and other integral lugs on said members to support the manifold on an engine, all of said members being formed by molding a compound of thermo-setting resin and coating the walls of said members with conductive metal par ticles while molding.

9. A radio shielding manifold adapted to receive a plurality of ignition wires leading to the spark plugs of an engine, comprising a pair of semi-tubular members having corresponding clamp lugs to hold the members in registration, outlet bosses formed integrally at the junction of said members, and other integral lugs on said members to support the manifold on an engine, all of said members being formed by molding a thermo-setting resin and forming a conductive coating on said members.

10. A tube adapted to shield a plurality of insulated electric conductors disposed therein, said tube walls being composed of synthetic resin molded in two uniform complementary sections, metallic particles of low resistivity blended in the resin to form a continuous conductor in said tube walls, and clamp lugs integral with the contacting edges of said sections.

11. A tube adapted to shield a plurality of insulated electric conductors disposed therein, said tube walls being composed of synthetic resin molded in two uniform complementary sections, metallic particles of low resistivity blended in the resin to form a continuous conductor in said tube walls, split screw threaded nipples extending integrally from said sections, and clamp lugs integral with each section whereby they may be united.

12. A tube adapted to shield a plurality of insulated electric conductors disposed therein, said tube walls being composed of synthetic resin molded in two uniform complementary sections, metallic particles of low resistivity disposed on the entire surface of both sections to form a. conductive layer thereover, inlet and outlet bosses integral with said sections, and lugs formed on having corresponding the respective sections whereby they may be clamped together.

13. A rigid radio shielding manifold adapted to enclose a plurality of ignition wires, said manifold being composed of a molded thermo-setting composition of high resistivity and a large nurnber of metallic particles distributed in the composition so as to form a continuous path of low resistance around the wires.

14. A rigid radio shielding manifold adapted to enclose a plurality of ignition wires, said manifold being composed of a thermo-plastic composition of high resistivity which is rigid at normal temperature and a large number of metallic particles distributed substantially uniformly throughout the composition, the resistance of the manifold and the efl'ectiveness of the shield being predetermined in accordance with the proportion of the metallic particles to the thermo-plastic composition.

claim 15, in which the manifold comprises at least two complementary sections, and a plurality of the metallic particles in one section engaging a plurality of those in the other section to provide an electrically conductive path between the sections.

SAMUEL TIERNEY, Jm 

